Fix color_adjust rgb error

resources/functions.php

@@ -1231,6 +1231,7 @@
 				if (substr_count($color, 'rgb') != 0) {
 					$color = str_replace('rgb', '', $color);
 					$color = str_replace('a(', '', $color);
+					$color = str_replace('(', '', $color);
 					$color = str_replace(')', '', $color);
 					$wrapper = true;
 				}